Ep. 50: Return of the Acrobat Clan
A consortium of international criminals tricks Speed Racer and the Car Acrobatic Team (though seen a few times during flashbacks, the team is minus Snake Oiler, either dead or still injured as a result of his crash in "The Most Dangerous Race") into a dangerous grudge race; this in order to destroy them and also smoke out Racer X, a.k.a. Secret Agent 9. The criminals attack Racer X and reveal themselves to be behind many of the clandestine actions seen in previous episodes. Racer X barely escapes an assassination attempt and warns Speed and the Car Acrobatic Team, that whose vehicles have been rigged with explosives. The Car Acrobats turn the tables on the gang, while Speed gets a surprising reaction when he finally inquires as to Racer X's true identity. Note: This episode is a sequel to "The Most Dangerous Race." It also follows up on the events of "Gang of Assassins," "The Secret Invaders," and "The Dangerous Witness." (Source: Wikipedia)